An airplane accelerates at a rate of 5 for 15 seconds. If it is going 200 m/s, how fast is it going before it started accelerating?

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?